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Steel racking with mass 100 lb and surface area 50 ft2 is used to carry products into a batch dry...

Steel racking with mass 100 lb and surface area 50 ft2 is used to carry products into a batch drying oven at 500 F. The combustion efficiency of the oven is 70%. The specific heat of steel is 0.12 Btu/lb-F, and the convection coefficient is 2 Btu/hr-ft2-F. If the racking enters the oven at room temperature of 70 F and the drying process takes 0.25 hours, calculate the exit temperature of the racking, and the heat and fuel energy loss to the racking with each drying cycle.

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